1/B resistance oscillations within the superconducting regime of heterostructure with disordered superconductor

ORAL

Abstract

In-situ growth of Al on top of shallow InAs 2DEG heterostructures gives close to perfect superconducting proximity effect [1]. In recent work, we used anodic oxidation to thin down the Al by oxidizing from the top down, allowing us to create an ultra-thin and disordered Al film with a large perpendicular critical field Bc >3 T on a mesoscopic structure. [2]
For B>Bc, the sample resistance rises to >1 kΩ whereas for B<Bc, we observe reproducible resistance oscillations of <30 Ω. The oscillations have a 1/B periodicity from which standard SdH analysis yields a density matching closely with the carrier density of the underlying 2DEG. This indicates strong electronic contact between the disordered Al layer and the high mobility InAs 2DEG, creating a novel material system to study disordered 2D superconductivity.
Furthermore, fully oxidizing the Al layer gives rise to quantum Hall effect (ρxx=0) emerging at B~2.5 T [2] making this material system a candidate for studying proximitized quantum Hall edge states with close to unity transparency to the superconducting Al, contacting the 2DEG from the top.

[1] M. Kjærgaard et al. Nature commun. 12841 (2016)
[2] A. C. C. Drachmann et al. work in progress (2019)

*This research was supported by Microsoft and the Danish National Research Foundation

–

Presenters

  • Asbjorn Drachmann

    • Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen

Authors

  • Asbjorn Drachmann

    • Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen

  • Abhishek Banerjee

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen
    • Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen

  • Antonio Fornieri

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen
    • Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen

  • Alexander Whiticar

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen
    • Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen

  • Candice Thomas

    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Department of Physics and Astronomy and Birck Nanotechnology Center, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Purdue University
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA

  • Sergei Gronin

    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum Purdue

  • Tiantian Wang

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Birck Nanotechnology Center, Purdue University

  • Geoff C Gardner

    • Purdue University
    • Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907, USA
    • Microsoft Quantum Purdue
    • Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Physics, Purdue University

  • Michael Manfra

    • Physics and Astronomy, Purdue Univ
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, School of Materials Engineering, School of Electrical and Computer Engineering, Purdue
    • Purdue Univ
    • Purdue University
    • Microsoft Quantum at Station Q Purdue
    • Department of Physics and Astronomy, Birck Nanotechnology Center, Microsoft Quantum Purdue, School og Materials Engineering & School of Electrical and Computer Engineering, P
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy, PURDUE UNIVERSITY
    • Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Physics, Purdue University

  • Charles Marcus

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Lab Copenhagen and Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Univ of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab - Copenhagen, University of Copenhagen
    • Center for Quantum Devices, Microsoft Quantum Lab – Copenhagen and Niels Bohr Institute, University of Copenhagen
    • Microsoft Corp
    • Niels Bohr Institute, University of Copenhagen